Several elements were broken after updating the Material library.

Add new component for combobuttons, which allow selecting and applying a 
value in one connected element.

Most importantly remove the standalone switch and let the service always 
send postMessage, even when there is no surrounding application 
listening. This helps testability and has no downsides.

Also:
- Make methods static where applicable
- Remove useless variables and methods
- Improve variable initialisation (to allow undefined)

Update/angular 16

- Remove global dialog style

- This allows to assign a font to a text in MatFabButtons

with ng update @angular/material@16 @angular/cdk@16
- run npm audit fix

causes problems after update

New character: protected dash (which does not break lines)

#455

#452